SOLUTION: Prove the identity: Cos^4x-sin^4x/cosx+sinx=cosx-sinx

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Question 889497: Prove the identity:
Cos^4x-sin^4x/cosx+sinx=cosx-sinx
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Is the denominator cos ? Or cos - sin ?
either way, it's not an identity.